If many inputs may be active simultaneously then the output bandwidth must be at least as great as the total bandwidth of all simultaneously active inputs. In this case the multiplexor is also known as a concentrator.

2. (storage) Writing multiple logical copies of datafiles. Placing the copies on totally separate paths to mirrored devices greatly reduces the probability of all copies being corrupt. Multiplexing differs from mirroring in that mirroring takes one data file and copies it to many devices, thus making it possible to copy a corrupt file many times. Multiplexing writes the data files to many places simultaneously; there is no "original" data file.